Ultrasonic bath.

I would try detergent and hot water as a first try. Many of the commercial fluids seem to contain a seaweed extract plus citrus fruit concentrates. I have used the latter for grease cleaning and it is remarkably effective and safe.

Here is a data sheet for another, not much of them lying around the boat! http://www.allendale-ultrasonics.co.uk/docs/ultra/us-so-car-solution.pdf
 
We clean the aircraft engine parts/filters in one at work using aviation fuel (Jet A1) or paraffin as the cleaning solution. I have used it to clean rigging screws of grease and countless other parts for the boat. It is only a smallish one - about 5 litres and unheated but if left on for a reasonable amount of time the energy put in heats it up anyway. Works a treat.
 
Sorry but old thread resurrected! I have a 10litre ultrasonic bath with a heater. I had planned on cleaning my honda carbs . I can get my hands on A1 or paraffin. Is it ok to heat. Mine has a heater up to 80 centigrade? Nik
 
My ultrasonic bath is heated too. I tend to throw anything very soiled in my parts washer (Old dishwasher before Ultrasonic cleaning. I use truckwash In mine. Not as smelly as jet fuel
 
I would be very careful using kero or A1 in a heated bath. Both have a flash point of around 38C, so above that there will a flammable vapour cloud above the bath. Aqueous with detergent seems much safer.
 
I would be very careful using kero or A1 in a heated bath. Both have a flash point of around 38C, so above that there will a flammable vapour cloud above the bath. Aqueous with detergent seems much safer.

No doubt the kero would degrease the carburettor, but not by the ultrasonic action. The latter is based on generating cavitation in an aqueous solution. I usually leave the part overnight in petrol and then transfer it to the ultrasonic bath. For jewelry, warm water and washing-up liquid. For carbs, floor cleaner with citrus or equivalent.
 
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